Recomended: A hybrid derived from the Colorado state flower, the petals and spurs are an incredibly rich, shining violet-blue. The name honors the memory of the students and teacher of Columbine High School who shall never be forgotten. Perennial. Height: 14 to 24 inches. Width: 15 to 18 inches. Sun: Partial Sun. Soil Moisture: Moderate watering. Hardiness: USDA zones 3-9 (up to 9,000'). Culture: Loamy, well-drained soils are best.